"SfR Fresh" - the SfR Freeware/Shareware Archive 
Member "inkscape-0.46/share/extensions/README" of archive inkscape-0.46.zip:
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1 This folder contains Inkscape extensions, i.e. the scripts
2 that Inkscape uses to perform some specialized functions.
3
4 Each *.inx file contains a description of an extension,
5 listing its name, description, prerequisites, etc. These
6 files are read by Inkscape on launch. Other files are
7 the scripts themselves (Perl, Python, and Ruby are
8 supported, as well as shell scripts).
9
10 Some of the scripts here are not (yet) hooked up to Inkscape
11 in any way but can be used from the command line (e.g.
12 inkscape-shadow*).